High modulus polyethylene terephthalate fibers



DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice 01' Dec. 16. 1969. 869 O.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. Ihe heading of each abstract indicates the number pages or specification, including claims and sheets of drawings contained in the application as originally died. The files 01 these applications are available to the public for inspection and reproduction may be purchased for cents a sheet.

Defensive Publication applications have not been examined as to the merits ot alleged invention. The Patent Oflice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED JUNE 23, 1970 i 875 O.G. 383

T875,021 HIGH MODULUS POLYETHYLE'NE TEREPHTHALATE FIBERS Darryl S. Addington, 182 Hillview, Memphis, Tenn. 38109, and Gordon W. Spangler, P.0. Box 511, Kingsport, Tenn. 37662 Filed Aug. 18, 1969, Ser. No. 855,071 Int. Cl. C08g 17/06; D02j I/ZZ, 11/00 US. Cl. 260- 1 Sheet Drawing. 9 Pages Specification High modulus polyethylene terephthalatestaple fibers having a high degree of dimensional stability. The fibers are characterized by an ultimate tenacity greater than 5 grams/denier, an ultimate elongation less than 30%, a tenacity at 10% elongation greater than 3 grams/denier. and a shrinkage in 190 C. air less than 4%. Dimensional stability is accomplished by subjecting the fiber to a 2 step heatsetting process whereby the fiber is first heatset at constantsleugth and then in a tensionless state at a temperature between C. and C.

June .23, 1970 5, ADDINGTQN ET AL T875,021

HIGH MODULUS P OLYETHYL-ENE TEREPHTHALATE FIBERS Filed Aug. 18, 1969 TOE DARRYL S. ADDINGTON GORDON W-. SPANGLER INVENTORS ATTORNE Y 

